Method for NDE of thermal embrittlement of duplex stainless steels

Toru Goto; Takesi Naito; Shintaro Kumano

doi:10.1117/12.259166

14 November 1996 Method for NDE of thermal embrittlement of duplex stainless steels

Toru Goto, Takesi Naito, Shintaro Kumano

Proceedings Volume 2947, Nondestructive Evaluation of Utilities and Pipelines; (1996) https://doi.org/10.1117/12.259166
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

Abstract

To verify and maintain the integrity of duplex stainless steels currently in service, we conducted a study in order to develop a method to nondestructively estimate their Charpy-impact energy at room temperature. Hardness of the ferrite phase was found to be a reliable indicator of the process of embrittlement during long-term heating for duplex stainless steels, but further information on the ferrite phase and the austenite phase is required for the estimation of Charpy-impact energy. An equation involving the hardness values of the ferrite and austenite phases,the ferrite content, and the average spacing of ferrite phase islands was found to be applicable in the nondestructive estimation of Charpy-impact energy at room temperature.

Citation Download Citation

Toru Goto, Takesi Naito, and Shintaro Kumano "Method for NDE of thermal embrittlement of duplex stainless steels", Proc. SPIE 2947, Nondestructive Evaluation of Utilities and Pipelines, (14 November 1996); https://doi.org/10.1117/12.259166

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